842 rnncEEDiyGS OF THE NATIONAL MUSEUM. VOL.XXH. 



Ifitrgaron ( Unto) litteus LEA, Syu., 1870, p. 46. 



* ? Unio semirugatus CHEXU, 111. Conch., 1858. pi. xn, figs. 2, 2a. 



"Unio merodabensis KUSTER, Conch. Cab. Unio, 1861, p. 233, pi. LXXVIII, fig. 4. 

 I'.I.AXKORD, J. A.s. Soc. Beng., XXXV, 1866, p. 142. " P.ETKL, Conch. Sam., 



Ill, 1890, p. 159. 

 *Unio vyneffwtganuts HAXLEY and THEOBALD,! Conch. Ind., 1876, p. 21, pi. xi.v, 



fig. 6. 



* Unio tennenti HAXLEY and THEOBALD, Conch. Ind., 1876, p. 22, pi. XLV, figs. 7-9. 



1' 1:11:1.. (Ouch. Sam. ,111, 1890, p. 169. 

 I ni<> />liai/rexi THEOBALD, manuscript. 



PARREYSIA CORRUGATA var. L^VIROSTRIS Benson. 



" Ciiio Id-rirostna BEXSOX, Ann. and Mag., 1862, p. 192; * Jl. As. Soc. Beng., 1862, 

 xxxv, p. 144. "P.-ETEL, Conch. Sam., Ill, 1890, p. 157. 



* Unio corrugatux var. hvcirostris HAXLEY and THEOBALD, Conch. Ind., 1876, p. 21, 



pi. XLIV, figs. 5, 6.* P.ETEL, Conch. Sam., Ill, 1890, p. 149. 



f PARREYSIA CORRUGATA var. NAGPOORENSIS Lea. 



*Unio nagpoorensis LEA, Pr. Ac. X. Sci. Phila., Ill, 1859, p. 331; * Jl. Ac. X. Sci. 



Phila., IV, 1860, p. 270, pi. XLV, fig. 150; *0bs., VII, 1860, p. 88, pi. XLV, fig. 



150. *BLAXFORD, Jl. As. Soc. Beiig., XXXV, 1866, p. 143. 

 *Margaron (Unio) naypoorensis LEA, Syn., 1870, p. 38. 

 *Unio corrugatus Miill. var. nat/poorensis HAXLEY and THEOBALD, Conch. Ind., 



1876, p. 21. P.ETEL, Conch. Sam., 1890, p. 149. 



India ; Burma.? 



t PARREYSIA WYNEGUNG^NSIS Lea. 



* Unio wynegitngcenais LEA,- Pr. Ac. X. Sci. Phila., Ill, 1859, p. 331; *J1. Ac. X. 



Sci. Phila., IV, 1860, p. 271. pi. XLV, fig. 151 ; *Obs., VII, 1860, p. 89, pi. XLV, 

 fig. 151. * BLANFORD, Jl. As. Soc. Beng., XXXV, 1866, p. 143. *SOWERBY, 

 Conch. Icon., XVI, 1868, pi. LXVII, p. 339. * P.ETEL, Conch. Sam., Ill, 1890, 

 p. 172. 



* Maryaron (Unio) wi/nef/iinga'nsis LEA, Syn., 1870, p. 50. 



Wyneguuga River, Bengal. 



t PARREYSIA FAVIDENS Benson. 



*? Mya spuria Wood, Ind. Test., 1825, p. 12, pi. n, fig. 35. 



*Unio favidens Bsxsox, 3 Ann. and Mag., X, 1862, p. 188; *J1. As. Soc. Beng., 

 XXXV, 1867, p. 138. "HAXLEY and THEOBALD, Conch. Ind., 1876, p. 6, 

 pi. xi, fig. 1. "REEVE, Conch. Icon., XVI, 1865, pl.xxvi, fig. 131. *P.ETEL, 

 Couch. Sam., Ill, 1890, p. 152. 



*Margaron (Unio) favidens LEA, Syn., 1870, p. 38. 



* Unio flarhlens P.ETEL, Couch. Sam., Ill, 1890, p. 152. 



*Unio trirostris MUSGRAVK, Hanley Phot. Conch., 1863, pi. n, fig. 9. * HAXLEY 

 and THEOBALD, 4 Conch. Ind., 1876, p. 6, pi. xi, fig. 6. * P^TEL, Conch. 

 Sam., Ill, 1890, p. 170. 



1 1 think this is corrngatus and not the ivynegunycemis of Lea. 



-Heavier, more elongated and pointed behind than corruyata, yet probably only 

 a variety of it. 



3 Several varieties, marcens, triyona, delta>, chrysis, viridula, and densa are given by 

 Benson, which hardly seem to me to be worth mentioning. 



4 This U. tripartite of Lea, with a darker epidermis and a more pronounced, 

 basal swelling. There is every variation iu the coloring and swelling. 



